योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-91, verse-54

आतिवाहिकदेहेन तेन बोधात्मनाणुना ।
बृहता वा यथाकामं निर्वाणात्मावतिष्ठते ॥ ५४ ॥

ātivāhikadehena tena bodhātmanāṇunā ,
bṛhatā vā yathākāmaṃ nirvāṇātmāvatiṣṭhate 54

54. ativāhikadehena tena bodhātmanā aṇunā
bṛhatā vā yathākāmam nirvāṇātmā avatiṣṭhate

54. By means of that subtle body (ativāhika), which is the consciousness-self (bodhātmā) and which can be minute or vast according to one's desire, the self (ātman) in a state of final liberation (nirvāṇa) abides.

Words meanings summery:

• अतिवाहिकदेहेन (ativāhikadehena) - by the subtle body

• तेन (tena) - by that, with that

• बोधात्मना (bodhātmanā) - by the consciousness-self, by the self of knowledge

• अणुना (aṇunā) - by the minute, by the subtle, by the atomic

• बृहता (bṛhatā) - by the vast, by the great, by the extensive

• वा (vā) - or, either

• यथाकामम् (yathākāmam) - according to desire, as one pleases

• निर्वाणात्मा (nirvāṇātmā) - the self (ātman) in a state of final liberation (nirvāṇa)

• अवतिष्ठते (avatiṣṭhate) - abides, remains, stands, persists

Words meanings and morphology

अतिवाहिकदेहेन (ativāhikadehena) - by the subtle body

(noun)

Instrumental, masculine, singular of ativāhikadeha

ativāhikadeha - subtle body

Compound type : karmadhāraya (ativāhika+deha)

• ativāhika – subtle, ethereal
  adjective (masculine)
  Derived from ati + vah (to carry beyond)
  Prefix: ati
  Root: vah (class 1)
• deha – body
  noun (masculine)

तेन (tena) - by that, with that

(pronoun)

Instrumental, masculine, singular of tad

tad - that, he, she, it

बोधात्मना (bodhātmanā) - by the consciousness-self, by the self of knowledge

(noun)

Instrumental, masculine, singular of bodhātman

bodhātman - consciousness-self, self of knowledge

Compound type : karmadhāraya (bodha+ātman)

• bodha – consciousness, awakening, knowledge
  noun (masculine)
  From root budh (to know, awaken)
  Root: budh (class 1)
• ātman – self, soul, spirit
  noun (masculine)

अणुना (aṇunā) - by the minute, by the subtle, by the atomic

(adjective)

Instrumental, masculine, singular of aṇu

aṇu - minute, atomic, subtle

बृहता (bṛhatā) - by the vast, by the great, by the extensive

(adjective)

Instrumental, masculine, singular of bṛhat

bṛhat - great, vast, extensive

वा (vā) - or, either

(indeclinable)

यथाकामम् (yathākāmam) - according to desire, as one pleases

(indeclinable)

Compound type : avyayībhāva (yathā+kāma)

• yathā – as, according to
  indeclinable
• kāma – desire, wish, love
  noun (masculine)

निर्वाणात्मा (nirvāṇātmā) - the self (ātman) in a state of final liberation (nirvāṇa)

(noun)

Nominative, masculine, singular of nirvāṇātman

nirvāṇātman - the self in nirvāṇa

Compound type : tatpuruṣa (nirvāṇa+ātman)

• nirvāṇa – extinction, cessation, liberation, bliss
  noun (neuter)
  From prefix nir- and root vā (to blow)
  Prefix: nir
  Root: vā (class 2)
• ātman – self, soul, spirit
  noun (masculine)

अवतिष्ठते (avatiṣṭhate) - abides, remains, stands, persists

(verb)

3rd person , singular, middle, present indicative (laṭ) of ava-sthā

Root sthā with prefix ava-

Prefix: ava

Root: sthā (class 1)